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  3. What proportion of cell-phone users use their phones regularly while driving? When are drivers at greatest risk from drowsines

What proportion of cell-phone users use their phones regularly while driving? When are drivers at greatest risk from drowsines

admin2011-01-14  38
问题 What proportion of cell-phone users use their phones regularly while driving?  
When are drivers at greatest risk from drowsiness?
选项
答案11 p.m. to 8 a.m.
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